Pipe union or coupling for electric-conduit junction-boxes and other purposes.



'H. M. BIGWOOD 61F. H'. TERRY. PIPE UNION 0R COUPLING FOR ELECTRIC GONDUIT JUNCTION BOXES AND OTHER PURPOSES.

Patentad Sept. 2, 1913.

APPLIOATION FILED NOV. 7, 1912.

' junction box to which the conduit pipes are with the pipes.

UNITED STATES hair irrr HENRY MALCOLM BIGWOOD AND FREDERICK HERBERT TERRY, OF WOLVERHAMIPTON.

ENGLAND.

PIPE UNION OB CGUPLING- F93 ELEGTBIO-GGNBUIT JUNCTION-BOXES AND OTHER PURPDSES.

Specification of Letters Patent.

Patented Sept. 2, 1913,

Application filed November 7, 1912. Serial No; 730,116.

To all whom itmay concern Be it known that we, HENRY MALCOLM Btowooo and Fnnonn'ron HERBERT TERRY, subjects of the King Great Britainfre siding at Albany road, Wolverhampton, and The Nook Penn, Wolverhampton, re* spectively, in the county of Stafford, England, have invented a new and useful Pipe Union or Coupling for Electric-Conduit Junction P-ioxes and other Purposes; and we do hereby declare the following to he a full, clear, and exact description of the same.

Our invention comprises improvements in electric conduit junction boxes and refers to that class of such wherein a longitudinal split loose ring is contracted around the pipe for the purpose of providing a frictional engagement therewith, the object of-our said invention being to provide an improved and more efiicient fitting of the specified type.

In order that our invention may be clearly understood and moro'readily carried into practice we have appended hereunto one sheet of drawings illustrating the, same wherein i Figure 1. illustrates an electrical conduit secured according to the present invention the unc tion being of the three way type one union being in its assembled position the second union being partly detached while the third union is in section. Fig.v QIil uStrates' the two tapered split menibers which are enn} ployed to establish frictional engagement in carrying our invention into practice as illustrated upon the accompanying draw lugs at Figs. 1 and 2 the socket ends 1 off the junction box. 2 are externally screwed to receive the cap nut 3 and internally bored to receive the conduit pipes i. The mouth of the sockets are bored taper as 5 to, receive acorrcsp ondingly externally tapered split ring 6 while the nut is similarly bored to receive a similar. split ring 7. They are made separate the members 6 being provided With a PEOJQCiJlOII 8 which engages the slot or opening 9 in the other ring, prevent rela tive rotation, thereby making lil, impossible for thetwoslots oropenings in therings to be in alinernent and thus making it irnpossh hie. for-watch or moisture td enter into the junction-box by way of these slots. Gr any other suitable means may he employed to prevent relative rotation of the ring.

It will be obvious that when the nut tightened up the two rings will he gripped betweenthe internally'tapered parts of the the pipe with which they will Inakeper'fect frictional engagement for owing to their formation and arrangement the bore of the nutand socket being thus contracted. about rings will remain parallel when contracted 1. In an electric conduit junction box the combination of a socket member externally screw-threaded and internally tapeged; .a'

nut internally screw-threaded to engage the threads of said socket and internally tapered; a pair of loose mugs each longitudinally split and externally 2. Tn an electriciconduitjunction boX, the I combination of a socket member externally tapered, one ring fitting within the, taper of the socket 'and the other within the taper of thenut;

screw-threaded and internally tapered;

nut internally screw-threaded to engage the threads of said socket and internally tapered; a pair of loose rings each longitudinally split and externally tapered, one

ring fitting within the taper of the socket and the other within the taper of the nut;

and means for preventing relative rotationbetween the two loose rings.

3. In a pipe union or coupling for electric conduit junction boxes andother purposes, the combination or" a socket member externally 'screiuthreaded and internally tapered;

a nut internally screw-threaded to engage 

